mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-26 21:32:10 +00:00
ea8e20696e
- Primarily useful for running some code with a specified stack size, when pthreads are available. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118222 91177308-0d34-0410-b5e6-96231b3b80d8
117 lines
2.9 KiB
C++
117 lines
2.9 KiB
C++
//===-- llvm/System/Threading.cpp- Control multithreading mode --*- C++ -*-==//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file implements llvm_start_multithreaded() and friends.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/System/Threading.h"
|
|
#include "llvm/System/Atomic.h"
|
|
#include "llvm/System/Mutex.h"
|
|
#include "llvm/Config/config.h"
|
|
#include <cassert>
|
|
|
|
using namespace llvm;
|
|
|
|
static bool multithreaded_mode = false;
|
|
|
|
static sys::Mutex* global_lock = 0;
|
|
|
|
bool llvm::llvm_start_multithreaded() {
|
|
#ifdef LLVM_MULTITHREADED
|
|
assert(!multithreaded_mode && "Already multithreaded!");
|
|
multithreaded_mode = true;
|
|
global_lock = new sys::Mutex(true);
|
|
|
|
// We fence here to ensure that all initialization is complete BEFORE we
|
|
// return from llvm_start_multithreaded().
|
|
sys::MemoryFence();
|
|
return true;
|
|
#else
|
|
return false;
|
|
#endif
|
|
}
|
|
|
|
void llvm::llvm_stop_multithreaded() {
|
|
#ifdef LLVM_MULTITHREADED
|
|
assert(multithreaded_mode && "Not currently multithreaded!");
|
|
|
|
// We fence here to insure that all threaded operations are complete BEFORE we
|
|
// return from llvm_stop_multithreaded().
|
|
sys::MemoryFence();
|
|
|
|
multithreaded_mode = false;
|
|
delete global_lock;
|
|
#endif
|
|
}
|
|
|
|
bool llvm::llvm_is_multithreaded() {
|
|
return multithreaded_mode;
|
|
}
|
|
|
|
void llvm::llvm_acquire_global_lock() {
|
|
if (multithreaded_mode) global_lock->acquire();
|
|
}
|
|
|
|
void llvm::llvm_release_global_lock() {
|
|
if (multithreaded_mode) global_lock->release();
|
|
}
|
|
|
|
#if defined(LLVM_MULTITHREADED) && defined(HAVE_PTHREAD_H)
|
|
#include <pthread.h>
|
|
|
|
struct ThreadInfo {
|
|
void (*UserFn)(void *);
|
|
void *UserData;
|
|
};
|
|
static void *ExecuteOnThread_Dispatch(void *Arg) {
|
|
ThreadInfo *TI = reinterpret_cast<ThreadInfo*>(Arg);
|
|
TI->UserFn(TI->UserData);
|
|
return 0;
|
|
}
|
|
|
|
void llvm::llvm_execute_on_thread(void (*Fn)(void*), void *UserData,
|
|
unsigned RequestedStackSize) {
|
|
ThreadInfo Info = { Fn, UserData };
|
|
pthread_attr_t Attr;
|
|
pthread_t Thread;
|
|
|
|
// Construct the attributes object.
|
|
if (::pthread_attr_init(&Attr) != 0)
|
|
return;
|
|
|
|
// Set the requested stack size, if given.
|
|
if (RequestedStackSize != 0) {
|
|
if (::pthread_attr_setstacksize(&Attr, RequestedStackSize) != 0)
|
|
goto error;
|
|
}
|
|
|
|
// Construct and execute the thread.
|
|
if (::pthread_create(&Thread, &Attr, ExecuteOnThread_Dispatch, &Info) != 0)
|
|
goto error;
|
|
|
|
// Wait for the thread and clean up.
|
|
::pthread_join(Thread, 0);
|
|
|
|
error:
|
|
::pthread_attr_destroy(&Attr);
|
|
}
|
|
|
|
#else
|
|
|
|
// No non-pthread implementation, currently.
|
|
|
|
void llvm::llvm_execute_on_thread(void (*Fn)(void*), void *UserData,
|
|
unsigned RequestedStackSize) {
|
|
(void) RequestedStackSize;
|
|
Fn(UserData);
|
|
}
|
|
|
|
#endif
|